roof LEXUS GS400 2000 Service Repair Manual

I04030
Fuses
Relays 1. DEF H±Fuse
2. ±
3. ±
4. MIR HTR Fuse
A. Ignition Main Relay
B. Mirror Heater Relay
E. Body ECU No.1
Passenger Side Instrument Panel Junction Block
5. ±
6. ±
7. S/ROOF Fuse
8. P FR DOOR Fuse
9. ±
10. ±
11 .
12. P/SEAT (P) Fuse
13. DOME Fuse
14. SEAT HTR Fuse
15. ±
16. TV Fuse
17. ECU±B2 Fuse
18. ±
19. ±
20. ±
21. P FR DOOR Fuse
2
21 34 5
67 8 9
10 11 12 13
14 15 16 17
18 19 20AB
E
C. Defogger Relay
D. Heater Relay
CD
1
BE±20
± BODY ELECTRICALPOWER SOURCE
2321 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

BE±28
± BODY ELECTRICALPOWER SOURCE
2329 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(a) Remove the fuse from the junction block and inspect the
connector on junction block side.
Fuse Tester connectionConditionSpecified condition
DEF 1 ± GroundConstantBattery positive voltage
MIR HTR 7 ± GroundIgnition switch ONBattery positive voltage
S/ROOF 13 ± GroundConstantBattery positive voltage
P FR DOOR 15 ± GroundConstantBattery positive voltage
P/SEAT (P) 23 ± GroundConstantBattery positive voltage
DOME 25 ± GroundConstantBattery positive voltage
S±HTR 27 ± GroundIgnition switch ONBattery positive voltage
TV 31 ± GroundConstantBattery positive voltage
ECU±B2 33 ± GroundConstantBattery positive voltage
P FR DOOR 41 ± GroundConstantBattery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.
(b) Remove the relay from the junction block and inspect the
connector on junction block side.
Relay Tester connectionConditionSpecified condition
Ignition Main 43 ± GroundIgnition switch ONBattery positive voltage
Mirror Heater 47 ± GroundIgnition switch ONBattery positive voltage
Mirror Heater 50 ± GroundConstantBattery positive voltage
If the circuit is not as specified, inspect the circuits connected
to other parts.

I04047
DOOR OFF ON
DOOR OFF ON w/ Sliding Roof w/o Sliding Roof
BE0GZ±03
I04048
Wire Harness Side BE±60
± BODY ELECTRICALINTERIOR LIGHT SYSTEM
2361 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. INSPECT FRONT PERSONAL LIGHT SWITCH CONTI-
NUITY
Switch positionTester connectionSpecified condition
Interior light switch
OFF (Lever switch)±No continuity
Interior light switch
DOOR (Lever switch)1 ± 3Continuity
Interior light switch
ON (Lever switch)1 ± 2Continuity
*Personal light OFF
(Push switch)±No continuity
*Personal light ON
(Push switch)1 ± 2Continuity
*: Set the interior light switch to OFF or DOOR.
If continuity is not as specified, replace the light assembly or
bulb.
2. INSPECT FRONT PERSONAL LIGHT SWITCH CIR-
CUIT
(See page DI±843)
Disconnect the connector from the switch and inspect the con-
nector on the wire harness side, as shown.
Tester connectionConditionSpecified condition
2 ± GroundConstantContinuity
1 ± GroundConstantBattery positive voltage
If circuit is not as specified, inspect power source or wire har-
ness.

IN04S±10
IN±20± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
20 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS
GENERAL INFORMATION
A large number of ECU controlled systems are used in the LEXUS GS400/GS300. In general, the ECU con-
trolled system is considered to be a very intricate system requiring a high level of technical knowledge and
expert skill to troubleshoot. However, the fact is that if you proceed to inspect the circuits one by one, trouble-
shooting of these systems is not complex. If you have adequate understanding of the system and a basic
knowledge of electricity, accurate diagnosis and necessary repair can be performed to locate and fix the
problem. This manual is designed through emphasis of the above standpoint to help service technicians
perform accurate and effective troubleshooting, and is compiled for the following major ECU controlled sys-
tems:
The troubleshooting procedure and how to make use of it are described on the following pages.
SystemPage
1. Engine 2JZ ± GEDI±1
2. Engine 1UZ ± FEDI±156
3. Automatic TransmissionDI±316
4. ABS & Hydraulic Brake Booster Power Supply SystemDI±387
5. Vehicle Skid Control (VSC) & Brake Assist (BA) SystemDI±473
6. Power Tilt and Power Telescopic Steering ColumnDI±517
7. Supplemental Restraint SystemDI±550
8. Power Seat Control SystemDI±683
9. Cruise Control SystemDI±704
10.Engine Immobiliser SystemDI±726
11. Combination Meter SystemDI±744
12.Sliding Roof SystemDI±764
13.Body No. 1 Control SystemDI±776
14.Body No. 2 Control SystemDI±820
15.Driver Door Control SystemDI±856
16.Passenger Door Control SystemDI±889
17.Rear Left Door Control SystemDI±921
18.Rear Right Door Control SystemDI±938
19.Multiplex Communication SystemDI±955
20.LEXUS Navigation SystemDI±1022
21.Air Conditioning SystemDI±1059
FOR USING OBDII SCAN TOOL OR LEXUS HAND±HELD TESTER

Before using the scan tool or tester, the scan tool's instruction book or tester's operator manual should
be read thoroughly.

If the scan tool or tester cannot communicate with ECU controlled systems when you have connected
the cable of the scan tool or tester to DLC3, turned the ignition switch ON and operated the scan tool,
there is a problem on the vehicle side or tool side.
(1) If communication is normal when the tool is connected to another vehicle, inspect the diagnosis
data link line (Bus
line) or ECU power circuit of the vehicle.
(2) If communication is still not possible when the tool is connected to another vehicle, the problem
is probably in the tool itself, so perform the Self Test procedures outline in the Tester Operator's
Manual.

SS0FF±03
SS±64
± SERVICE SPECIFICATIONSBODY
220 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
BODY
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
FRONT BUMPER±±±
Front bumper cover x Body5.45548 in.´lbf
Reinforcement x Body2930022
REAR BUMPER±±±
Reinforcement x Body2829021
HOOD±±±
Hood support x Hood2222516
Hood x Hood hinge2626519
Radiator support upper seal x Door lock8.08271
Hood lock nut x Hood lock8.08271
FRONT DOOR±±±
Outside handle x Door panel5.55649 in.´lbf
Door lock striker x Door panel2323517
Door hinge x Body32.533124
Door hinge x Door panel32.533124
Window regulator x Door panel1111 28
Door lock x Door panel5.55649 in.´lbf
REAR DOOR±±±
Outside handle x Door panel5.55649 in.´lbf
Door hinge x Door panel32.533124
Door hinge x Body32.533124
Window regulator x Door panel5.45548 in.´lbf
Door lock x Door panel5.45548 in.´lbf
OUTSIDE REAR VIEW MIRROR±±±
Outside rear view mirror x Door panel5.45548 in.´lbf
LUGGAGE COMPARTMENT DOOR AND HINGE±±±
Door hinge x Door panel8.08271 in.´lbf
Door lock striker x Body5.55649 in.´lbf
Door hinge x Body12.51279
FUEL LID±±±
Lock retainer x Opening lid5.55649 in.´lbf
Fuel lid lock assembly x Body Luggage side nut:5.55649 in.´lbf
Fuel lid side nut:8.08271 in.´lbf
FRONT WIPER AND WASHER±±±
Wiper arm x Wiper link2222016
Wiper link x Body5.45548 in.´lbf
SLIDING ROOF±±±
Drive rail x Bracket5.55649 in.´lbf
Sliding roof housing x Body5.55649 in.´lbf
Drive rail x Bracket8.08271 in.´lbf
Bracket x Body8.08271 in.´lbf
Sliding roof glass x Drive gear5.55649 in.´lbf

FI2553
SST
SF±2
± SFI (2JZ±GE)SFI SYSTEM
1468 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing SFI wiring connectors, terminals, etc.,
first disconnect the power by either turning the ignition
switch OFF or disconnecting the negative (±) terminal
cable from the battery.
HINT:
Always check the diagnostic trouble code before disconnecting
the negative (±) terminal cable from the battery.
(b) When installing the battery, be especially careful not to in-
correctly connect the positive (+) and negative (±) cable
terminals.
(c) Do not permit parts to receive a severe impact during re-
moval or installation. Handle all SFI parts carefully, espe-
cially the ECM.
(d) Do not be careless during troubleshooting as there are
numerous transistor circuits and even slight terminal con-
tact can further troubles.
(e) Do not open the ECM cover.
(f) When inspecting during rainy weather, take care to pre-
vent entry of water. Also, when washing the engine
compartment, prevent water from getting on the SFI parts
and wiring connectors.
(g) Parts should be replaced as an assembly.
(h) Care is required when pulling out and inserting wiring con-
nectors.
(1) Release the lock and pull out the connector, pulling
on the connectors.
(2) Fully insert the connector and check that it is locked.
(i) When inspecting a connector with a volt/ohmmeter.
(1) Carefully take out the water±proofing rubber if it is
a water±proof type connector.
(2) Insert the test probe into the connector from wiring
side when checking the continuity, amperage or
voltage.
(3) Do not apply unnecessary force to the terminal.
(4) After checking, install the water±proofing rubber on
the connector securely.
(5) Use SST for inspection or test of the injector or its
wiring connector.
SST 09842±30070